Can I unmask number who called me before I had MaskOff?

No, if someone called you with a blocked number before you had MaskOff, we can’t show you that number. Only the police or phone companies have that ability. However, once you have MaskOff, if that same person or anyone else calls you with a blocked number, you’ll be able to see who it is. Many times, people who hide their number and call once, will call again. That’s why having MaskOff on your phone is helpful — so you’re prepared for the next time.